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【简答题】
水平角就是从一点出发的两条方向线所构成的空间角在______的投影。水平角的观测方法有______和______。竖直角是空间方向线与______或______的夹角。空间方向线与______的夹角称为高度角；空间方向线与______的夹角称为天顶距。
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举一反三
【简答题】The old couple decided to__________ a boy and a girl though they had three children of their own.
【单选题】The old couple decided to move out of town to a quiet ______ , where they had spent several years immediately after their marriage.
A.
pace
B.
suburb
C.
neighborhood
D.
area
【单选题】在动物组织中,细胞分化的一一个普遍原则是
A.
细胞一旦转化为稳定类型后,一般不能逆转到未分化状态
B.
细胞一-旦转化为稳定类型后,很容易逆转到未分化状态
C.
细胞分化是一种暂时性的变化
D.
细胞分化发生在生物体整个生命进程的某一阶段
E.
细胞分化不具有可塑性
【简答题】一辆汽车开始以36km/h的速度行驶了15min,然后又以72km/h的速度行驶了5min,求这段时间内汽车的平均速度是____
【单选题】The old couple decided to ______ a boy and a girl though they had three of their own.
A.
adapt
B.
bring
C.
receive
D.
adopt
【单选题】The old couple decided to _____ a boy though they already had three of their own.
A.
adopt
B.
adapt
C.
bring
D.
receive
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